dd2010_decrypter.exe will leave the original encrypted file intact and create the new, unencrypted, file that you named. If you use a different name for the file, you won’t overwrite the original.

How to use dd2010_decrypter.exe to do batch processing:

Place the encrypted files in a directory (i.e. c:\encrypted_files\)

Copy dd2010_decrypter.exe into another directory and FROM THAT DIRECTORY, run the following command:
for %f in ("c:\encrypted_files\*.*") do dd2010_decrypter.exe %f %f.decrypted.

All files in the encrypted_files folder will be processed and the new decrypted files will have the same name but their extension will be "decrypted".CAUTION: be sure you put ONLY files that are to be decrypted into the target directory before you run dd2010_decrypter.exe.